Firefox remote debug “unexpected error” on Windows

Question

I need debug a web application in Firefox for "Android". I am trying to connect the device to desktop Firefox, but always got the error "unexpected error".

I have performed all steps of https://developer.mozilla.org/en-US/docs/Tools/Remote_Debugging/Firefox_for_Android

1. I installed the Android SDK Tools and Platforms, and the device is correctly detected with the adb command.

2. I enabled remote debugging on desktop Firefox and Firefox for Android

3. I enabled remote USB debugging on the device.

4. The device is connected to the original cable to my PC.

5. I run the command adb forward tcp: 6000 tcp: 6000 on the command line without problems.

6. Finally, the developer desktop Firefox menu, I choose the connect option. Page appears to connect to localhost: 6000, and clicking on the "connect" button, the error "unexpected error" appears.

Any ideas?

Answer 1

Found the solution!

Instead of typing:

adb forward tcp:6000 tcp:6000

type in the following:

adb forward tcp:6000 localfilesystem:/data/data/org.mozilla.firefox/firefox-debugger-socket

The first command is for firefox 34, for latter versions, you need the second.

Also, according to the docs:

For Firefox for Android builds in other channels, the org.mozilla.firefox part should be changed to:

• org.mozilla.firefox_beta for Beta
• org.mozilla.fennec_aurora for Aurora
• org.mozilla.fennec for Nightly